Magnum DS80F & DS80C Dual-speed Stackable Hubs Installation and User Guide (12/01)
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The DC power plug connector or “jack” is in the left rear of the chassis, like the
DS80F. The external 5VDC power supply is for either 95 - 125vac at 60 Hz for “-d” models or
120-250vac at 50Hz for “-i” models that have IEC power cable connector in the external power
supply housing.
2.2.3
10 / 100 Speed Auto-sensing
Ports #3 to 8, RJ-45 twisted pair HDX, support auto-sensing for speed independent of
the other ports. Speed-sensing is performed by the DS80F and DS80C’s electronics in
accordance with the standards of the IEEE 802.3u auto-negotiation standard. If the connected
device or node indicates that it is capable of 100Mbps speed, then operation on that port will be
at 100Mbps. If the connected device does not positively indicate that it is capable of 100Mbps
speed, then the operation on that DS80F and DS80C port will be at 10Mbps. Of course, the
auto-negotiation technique, on ports #3 to 8, is only for 10/100 speed, and does not provide for
any full-duplex operation.
The per-port 10/100Mbps Link/Activity LEDs on the top panel indicate the result of
auto-sensed speed detection, and the resulting connectivity to either a 10Mbps or 100Mbps
device. The Speed LED will illuminate (GREEN) when 100Mbps signals are detected; the Speed
LED will be OFF when 10Mbps signals (or no signals) are detected.
2.3
Up-link Port 1SW for Cascading
The unit has an up-link Port # 1SW, located on the left-front side of the hub. It enables
the port’s twisted pair cable to cascade to another shared hub, switching hub port or 10/100Mbps
switch. (See Section 4.6 for more details about up-link). Unlike ports #3 to 8, port #1SW is
capable of full- and half-duplex mode auto-sensing, based on the capability of the connected
device. The up-link feature operates the same, whether Port # 1SW is connected to either
100Mbps or 10Mbps devices. When the up-link port is used to cascade two DS80F series hubs,
the auto-sensing feature will cause the connecting link to operate at 100Mbps speed.
2.4
Fiber port for DS80F – Series
100Mbps Fiber port, ST-type mm or SC type(single-mode or multi-mode)
The Fast Ethernet fiber switched port on the Magnum DS80F is set to operate at fixed
T x Rx
F
H
= X
U P L IN K
Tx Rx
F
H
= X
UPLINK
F
H
